Motor



M. NYSTROM. MOTOR.

APPLICATION FILED MAY 20, I918.

Patented Dec. 7, 1920.

3 SHEETS-SHEET I.

M. NYSTHOM.

MOTOR.

APPLICATION FILED MAY 20, 1918.

' Patented Dec. 7, 1920.

3 SHEETS-SHEET 2.

M. NYSTROM', MOTOR.

APPLICATION FILED MAY20,1918. 1,3 1,174, Patented Dec. 7, 1920.

3 SHEETS-SHEET 3.

UNITED ST-AI ENT ()FFICE.

MARTIN NYSTROM, F cHIoAGo, ILLINOIS, ASSIGNOR TO THE BEUNswIcK-BAEKE; COLLENIDER ooMI ANY, OF CHICAGO, ILLINOIS, A CORPORATION or DELAWARE.

Moron.

Application filed May 20,

To all whom it may concern Be it known that I, MARTIN NYSTROM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Motors, of which the following is v a specification.

The object of this inventlon is to provide a spring motor of simple and comparatively inexpensive construction which is especially adaptedfor talking machines and which can be easily assembled and installed in a talking machine cabinet.

A further ob'ect of the invention is to provide simple means for overcoming the umping or spasmodic action of the springs and to prevent the same from being communicated to the spindle and the record. I

And a further object is to produce a talking machine spring motor which is noise less "in operation, which comprises comparatively few parts and which parts are accessible at all times for inspection or replace ment.

Figure is a plan view of the invention with portions of the motor board broken away, for the purpose of better illustration; Fig. 2 is a side elevation of the invention;

Fig. is an end elevation of Fig. 4 is a detail in section illustrating the winding mechanism; I

Fig. 5 is a detail in section of thegov ernor.

In talking machine construction it is usual to support the motor upon .a removable motor board while *the\tone arm isrigidly connected to a fixed part of the cabinet. It is highly desirable that all of themechanical parts of the talking machine be supported as a uhitary structure which may be assembled at a point remote from the place where the cabinet is constructed and mounted in the cabinet without the use of tools.

Specification of Letters Patent.

the invention The frame 1918. Serial No. 235,472.

with By reason of the construction described, I am enabled to assemble the mechanical devices of the talking machine independently of the cabinet as a unitary structure.

The motor is provided with the usual spindle 12 to support the record table which 1s preferably mountedon a ball step bearing 13. The spindle 12 is provided with a worm 14 and preferably actuated by engagement herewith of two worm gears 15 and 16 secured to sleeves 17 and 18 which are supported on arbors 19 and 20 and are actuated by springs within the spring barrels 21 and 22in the usual manner. In the present structure two opposed spring barrels are provided but it is to be understood that a I plurality, for example three or four spring barrels, may be arranged about and connected to the spindle 12. Arbors 19 and 20 are mounted in suitable hearings in the frame8 and support the spiral gears 23 and- 24 meshing with similar pinions 25 and 26 on a winding shaft 27 which is adapted to be rotated lo a-suitable handle (not shown). The usual ratchet mechanism for preventing return movement 'of the winding shaft 27 is provided but forms no part of my present invention and is consequently not illustrated in detail. I

Patented Dec. 7, 1920.

From the foregoing it will be readily appreciated that the spindle is driven directly from aplurality of springs.- The driving gears for the spindle are opposed thus equalizing the strain thereon because the spindle floats between the gears and all side thrust and friction at thegears is overcome. By using a plurality of springs the inequalities due to. jumping of the springs is prevented. It is extremely improbable that both springs should jump at the same time. Each spring compensates the other making the action smooth and uniform.

The spindle 12 is provided with a worm gear 28 meshing with the worm shaft 29 journaled in saitable hearings in the frame and supporting plurality. of governor springs 31, the latter being disposed-within a drum 32. The ends of the spring 30 are secured to collars 33 and 34, the latter being loose on the worm shaft 29 and supporting the drum a governor consisting of a 30 and weights 32. A lever 36 is pivoted at 37 on the frame drum 32. The other end of lever 36 is provided with two separate fingers 36, 36", one of which, 36, is bent downwardly and operates in a spiral groove 39 at the lower end of a pin 39' which is supported in the frame and motor board of the machine and is provided with a knurled head 40. The other finger 36 travels alongside the pin 39' and holds the finger 36 in the groove. When the pin is rotated by operating the head 40 the finger 36' is caused to move up or down in the groove and thereby swing the lever 36 and adjust the pad 38 relative to the drum. A spring 42 surrounding the pin 39 normally resiliently biases the pad 38 toward the drum 32. By rotating the head 40 the pad 38 ismoved toward and fromthe drum 32 and during the operation of the motor, when the weights 31 move outwardly under centrifugal force, the drum 32 is moved against the pad 38 to retard the speed of rotation of the mechanism. The drum 32 limits outward movement of the weights 31 and prevents breakage of the springs 30.

The brake lever 43 is actuated by any suitable mechanism preferably located on the motor board.

It will bereadily understood that I have perfected a motor and assemblage therefor which hasnumerous advantages over the motors herebefore known and commonly used in phonographs. All of the mechanical parts of the phonograph are assembled in" a unitary structure; the spindle is driven in a direct and simple manner and in such a way as to insure uniform action.

Obviously various changes maybe made in the form, construction'and arrangement of' the parts without departing from the spirit and scope of the invention or sacrificing any of the material advantages thereof, the form hereinbefofe described being merely the preferred embodiment thereof.

I claim: 4 1. In a motor, a pair of driving shafts, a

driven shaft disposed between the driving" shafts and in perpendicular relation thereto, and worm gearing arranged in the same plane between the several shafts, and having the central point of meshing contact located and passing through the axes of the driving shafts.- 1 'i 2. A spring motor for talking machines, comprising a pair of independent spring actuated drive shafts,-a worm shaft disposed between the drive shafts and perpendicular thereto, and worm gears on the drive shafts in mesh with the worm shaft, the worm and worni gears being in the same plane and having the center of meshing contact on a straight line passing through the axes of the drive shafts.

3. A spring motor for talking machines, comprising a record table receiving and supporting spindle provided witha worm, independent spring actuated drive shafts at opposite sides of the said spindle and perpendicular thereto and in parallel relation, worm gears connecting the drive shafts with the spindle and in the same plane therewith and having the center of meshing contact on a straight line passing through the axes of the drive shafts, winding gears on the spring actuated drive shafts parallel with the worm gears, and a winding shaft perpendicular to the spindle and in mesh with the winding gears.

a MARTIN NYSTROM.

' Witnesses .50 in a straight line in the plane of the gearing 

